heres what the
java API says regarding this method :
java.sql.Blob
public OutputStream setBinaryStream(long pos) throws SQLException
Retrieves a stream that can be used to write to the BLOB value that this Blob object represents. The stream begins at position pos. The bytes written to the stream will overwrite the existing bytes in the Blob object starting at the position pos. If the end of the Blob value is reached while writing to the stream, then the length of the Blob value will be increased to accomodate the extra bytes.
Note: If the value specified for pos is greater then the length+1 of the BLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.
Parameters:
pos - the position in the BLOB value at which to start writing; the first position is 1
Returns:
a java.io.OutputStream object to which data can be written
Throws:
SQLException - if there is an error accessing the BLOB value or if pos is less than 1 SQLFeatureNotSupportedException - if the JDBC driver does not support this method
Since:
1.4
See Also:
Blob.getBinaryStream
so this method is supported , according to the API anyway.